Parasol base



FIG. 1 is a top, front and right side perspective view of a parasol base, showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a front view thereof.

The broken lines depict portions of the parasol base that form no part of the claimed design. 

CLAIM The ornamental design for a parasol base, as shown and described. 